Real Algebraic and Analytic Geometry |

An elementary proof that the length of X

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Submission: 2004, February 13.

*Abstract:
An elementary proof is given, to show that the quartic form
X _{1}^{4}+X_{2}^{4}+X_{3}^{4}+X_{4}^{4}
cannot be written as a sum of three squares of real quadratic forms.*

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